WINGs/error.c

   1 /*
   2  *  Window Maker miscelaneous function library
   3  *
   4  *  Copyright (c) 1997-2003 Alfredo K. Kojima
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  19  *  MA 02110-1301, USA.
  20  */
  21
  22 #include "wconfig.h"
  23
  24 #include <stdarg.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29
  30 #include <WUtil.h>
  31 #include <WINGsP.h>
  32
  33 #ifdef HAVE_SYSLOG_H
  34 #include <syslog.h>
  35
  36 static Bool syslog_initialized = False;
  37
  38
  39 static void syslog_open(const char *prog_name)
  40 {
  41         int options;
  42
  43         if (!prog_name)
  44                 prog_name = "WINGs";
  45
  46         options = LOG_PID;
  47         openlog(prog_name, options, LOG_DAEMON);
  48         syslog_initialized = True;
  49 }
  50
  51 static void syslog_message(int prio, const char *prog_name, const char *msg)
  52 {
  53         if (!syslog_initialized)
  54                 syslog_open(prog_name);
  55
  56         //jump over the program name cause syslog is already displaying it
  57         syslog(prio, "%s", msg + strlen(prog_name));
  58 }
  59
  60 void w_syslog_close(void)
  61 {
  62         if (syslog_initialized) {
  63                 closelog();
  64                 syslog_initialized = False;
  65         }
  66 }
  67 #endif
  68
  69 void __wmessage(const char *func, const char *file, int line, int type, const char *msg, ...)
  70 {
  71         va_list args;
  72         char *buf;
  73         static int linemax = 0;
  74         int truncated = 0;
  75 #ifdef HAVE_SYSLOG
  76         int syslog_priority = LOG_INFO;
  77 #endif
  78
  79         if (linemax == 0) {
  80 #ifdef HAVE_SYSCONF
  81                 linemax = sysconf(_SC_LINE_MAX);
  82                 if (linemax == -1) {
  83                         /* I'd like to know of this ever fires */
  84                         fprintf(stderr, "%s %d: sysconf(_SC_LINE_MAX) returned error\n",
  85                                 __FILE__, __LINE__);
  86                         linemax = 512;
  87                 }
  88 #else /* !HAVE_SYSCONF */
  89                 fprintf(stderr, "%s %d: Your system does not have sysconf(3); "
  90                         "let wmaker-dev@windowmaker.org know.\n", __FILE__, __LINE__);
  91                 linemax = 512;
  92 #endif /* HAVE_SYSCONF */
  93         }
  94
  95         buf = wmalloc(linemax);
  96
  97         fflush(stdout);
  98
  99         /* message format: <wings_progname>(function(file:line): <type?>: <message>"\n" */
 100         strncat(buf, _WINGS_progname ? _WINGS_progname : "WINGs", linemax - 1);
 101         snprintf(buf + strlen(buf), linemax - strlen(buf), "(%s(%s:%d))", func, file, line);
 102         strncat(buf, ": ", linemax - 1 - strlen(buf));
 103
 104         switch (type) {
 105                 case WMESSAGE_TYPE_FATAL:
 106                         strncat(buf, _("fatal: "), linemax - 1 - strlen(buf));
 107 #ifdef HAVE_SYSLOG
 108                         syslog_priority = LOG_CRIT;
 109 #endif
 110                 break;
 111                 case WMESSAGE_TYPE_ERROR:
 112                         strncat(buf, _("error: "), linemax - 1 - strlen(buf));
 113 #ifdef HAVE_SYSLOG
 114                         syslog_priority = LOG_ERR;
 115 #endif
 116                 break;
 117                 case WMESSAGE_TYPE_WARNING:
 118                         strncat(buf, _("warning: "), linemax - 1 - strlen(buf));
 119 #ifdef HAVE_SYSLOG
 120                         syslog_priority = LOG_WARNING;
 121 #endif
 122                 break;
 123                 case WMESSAGE_TYPE_MESSAGE:
 124                         /* FALLTHROUGH */
 125                 default:        /* should not happen, but doesn't hurt either */
 126                 break;
 127         }
 128
 129         va_start(args, msg);
 130         if (vsnprintf(buf + strlen(buf), linemax - strlen(buf), msg, args) >= linemax - strlen(buf))
 131                 truncated = 1;
 132
 133         va_end(args);
 134
 135         fputs(buf, stderr);
 136 #ifdef HAVE_SYSLOG
 137         syslog_message(syslog_priority, _WINGS_progname ? _WINGS_progname : "WINGs", buf);
 138 #endif
 139
 140         if (truncated)
 141                 fputs("*** message truncated ***", stderr);
 142
 143         fputs("\n", stderr);
 144
 145         wfree(buf);
 146 }
 147